Martha Washington to Frances Bassett Washington, 15 June 1794. The original manuscript letter can be found at the Rosenbach Museum and Library. Martha Washington writes to her niece about worms, the yellow fever, spinets, and enslaved people. Notes and suggestions for further reading: The London Practice of Physic, (London: Printed for Robinson, Baldwin, and Bew in Paternoster-Row 1785.) William Pearce, Washington Library Digital Encyclopedia. 1794 Philadelphia Directory, page 117. https://archive.org/details/philadelphiadire1793phil Carey, Matthew, A Short Account of the Malignant Fever, Lately Prevalent in Philadelphia (Philadelphia: Printed by the Author, 1793). Reports on the Yellow Fever Epidemic, 1793. https://www.gilderlehrman.org/history-resources/spotlight-primary-source/reports-yellow-fever-epidemic-1793#:~:text=Between%20August%201%20and%20November,and%20skin%20of%20the%20victims.